2 pointsHalf round file Stu- one with fine teeth and gently and patiently- very easy to catch the edge and bend it. Here it is in the spider- I’m about to fit it to the tube- hope I didn’t mess up any measurements
1 pointStarting the year with a widefield narrow band rig with 135mm f2.5 Asahi Super Takumar Lens as used on vintage SLR film cameras such as the Pentax Spotmatic. These are superb quality lenses even at full aperture and all my imaging has been with full aperture. Camera - ZWO ASI 1600MM-Cool with ZWO EFW and Astrodon 3nm filters. Rig mounted on EQ8 and without guiding at first. Capture with RPi 3 running INDI firmware and saved in Linux Mint desktop indoors running KStars/Ekos.
1 pointThat's pretty much how my D-Bot is. The wheels are on diagonally opposite corners. With a heavy bed it's best to use 1mm pitch screws to avoid 'back-driving' when power is removed or z motor(s) de-energised. That's assuming 1 motor per screw. If just 1 motor with screws driven by belt/pulley arrangement then steeper screws may be ok.